Radio transmitter



FIG. 1 is a front view of the radio transmitter.

FIG. 2 is a back view thereof;

FIG. 3 is a right side view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a top view thereof;

FIG. 6 is a bottom view thereof; and,

FIG. 7 is a perspective view thereof.

The broken lines shown in the drawings form no part of the claimed design. 

The ornamental design for the radio transmitter, as shown and described. 